Eugene Island block 330 oil field
| Eugene Island block 330 oil field | |
|---|---|
| Country | United States |
| Region | Gulf of Mexico |
| Block | Eugen Island 313, 314 south, 330, 331, 332, 337, 338 |
| Offshore/onshore | offshore |
| Operators | Apache Corporation; Devon Energy |
| Field history | |
| Discovery | 1971 |
| Start of development | 1971 |
| Start of production | 1972 |
| Peak year | 1977 |
| Production | |
| Peak of production (oil) | 95,290 barrels per day (~4.748×106 t/a) |
| Peak of production (gas) | 482,000 million cubic feet per day (13,600×106 m3/d) |
| Producing formations | Pliocene- sands |
Eugene Island block 330 oil field is an oil field in the United States Exclusive Economic Zone in the Gulf of Mexico. It is located 170 miles (270 km) southwest of New Orleans, 70–85 miles (113–137 km) off the Louisiana coast comprising six and a half leased blocks: Eugene Island 313, 314 south, 330, 331, 332, 337 and 338.
In the outer continental shelf lease sale on December 15, 1970 240,361 hectares (593,940 acres) were offered for lease, including Eugene Island blocks. The Block 330 area was acquired by Pennzoil (now part of Royal Dutch Shell). As the Pliocene- sands were considered geochemically immature and wells drilled to the north of Block 330 discovered natural gas, Pennzoil expected to discover a natural gas not oil. The oil field was discovered in March 1971 while drilling the 1 OCS G-2115 well. Approximately at the same time oil was discovered by Royal Dutch Shell in the adjoining block 331.
By the end of 1971, two platforms had been installed in the field. The first development well was drilled on Block 330 by Pennzoil's "A" platform in November 1971. Production started in September 1972 in the block 331. During 1972 four more platforms were installed and later the number of platforms increased to nine.
From 1975 to 1980, the field was the largest producing field in the Federal outer continental shelf. Production peaked in 1977 by 95,290 barrels (15,150 m3) of liquids (crude oil and gas liquids) and 482,000 million cubic feet (13,600×106 m3) per day.Enhanced oil recovery operations started in August 1975. Water injection was used on blocks 331 and 314, and starting from December 1979 gas injection was used on block 330.
The field is an anticlinal structure on the downthrown side of a major salt diapir associated growth fault and produces from 25 Pliocene- delta-front sandstone reservoirs at depths from 1290 to 3600 m. The structure was located with reconnaissance reflection seismology 2D lines recorded from 1966 to 1970, coupled with well data defined and isopach maps indicating large delta systems. Relative amplitude seismic profiles reveal "prominent hydrocarbon indicators" such as bright spots and flat spots, and seismic facies analysis show shingled, oblique and sigmoid reflections typical for delta-front sandstones.
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